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铜川矿区含煤地层为早二迭世山西组(P_1~1)和晚石炭世太原统(C_3)。山西组在矿区内主要为一套陆相碎屑沉积,分为上、下两段,下段(P_(s_1))厚约40米,上段(P_(s_2)近已划归石盒子组)厚约20米。此两段的岩性有相似性,即各段上部皆以粉砂~泥质岩为主,下部则以粗碎屑岩为主。下段底部砂岩被沿用为煤系地层中的标志层,称
The coal-bearing strata in Tongchuan area are Early Permian Shanxi Formation (P_1 ~ 1) and Late Carboniferous Taiyuan System (C_3). The Shanxi Formation is mainly composed of continental clastic sediments in the mining area, which are divided into upper and lower two sections. The lower section (P_ (s_1)) is about 40 meters thick. The upper section (P_ (s_2) About 20 meters. The two lithologies are similar, that is, the upper part of each section is dominated by silt-mudstone, while the lower part is dominated by coarse clastic rock. The bottom of the lower sandstone is used as a marker layer in the coal-bearing strata, said